Boiler end plate.



PATENTED AUG. 16, 1904.

G.Y.VBONUS. BOILER END PLATE;

' APPLICATION FILED OCT 31, 190

I0 IODEL.

' I j rzz 201 J aeagggyb onlbs cago, in the county of Cook and State of Illiof such shape that they can be passed-through said holes.

I v UNITED STATES Patented August 16, 1904. I:

PATENT OFFICE.

GEORGE Y. BONUS, OF OHICAGO,-ILLINOIS, ASSIGNOR TO HANNAH L.-

BONUS, OF CHICAGO, ILLINOIS.

BOILER END PLATE.

SPECIFICATION forming part of Letters Patent No. 768,011, dated August 16, 1904:.

Application filed octoller 31, 1903.

T0 ctZZ whom, it may concern.-

Be it known that I, GEORGE Y. BoNUs, a citizen of the United States, residing at Ohinois, have invented a new and useful Boiler End'Plat'e, of which the following is a specification.

My invention relatesto improvements in boiler end plates'particularly adapted to be used on water-tube boilers, but may be used on any other class of boilers; and it'consists of a construction of the end plate whereby the water-tubes can be moved through the openings provided therefor, the covers of said openings are removable through said openings, and the said openings and covers are of such shape and-so arranged inf conjunction with tie-bolts to materially strengthen the boiler and produce the lightest possible construction.

In boilers of theclass of which this invention is applicable it is desirable to assemble the'tubes as close togetheras possible without weakening the end plates to such a degree as to reduce the pressure strength of the-boiler. Another very desirable construction is to have the covers to the tube-removing holes Heretofore when the tubeswere closely assembled round; covers were employed to close the tube-removing holes andto accommodate the necessary tie-bolts. This system is somewhat objectionable, because it is necessary to providesome convenient way of taking the covers out of the boiler, and the most convenient way to accomplish this is to provide a series of elliptical holes large enough to permit the passage of any of the covers therethrough. 'Ihese elliptical holes necessarily have to be made through a portion of the end plate, which is otherwise well strengthened, and are therefore placed adjacent to the bottom edge( With this system when it is desired to place a cover in one of the tube-removing holes a wire or cord is inserted into said opening and is lowered inside of the boiler to one of the larger elliptical openings, where a cover isinserted and secured to the end of said wire or cord, by

Serial No. 179,262- (Ilo model.)

means of which it is raised to the desired tube-removing hole. It will be seen that this is not a very convenient way of inserting the tube-rem oving-holecovers, although it is in extensive use. Another system used is to make all the tube-removing holes elliptical, so that each cover can be inserted or removed through the hole which said cover closes. In this system the tube-removing holes cover so large an area that no space is available for tie-bolts, and necessarily the end plates will have to be made of cast sections to obtain the required strength. While this system provides a convenient means of inserting and removing the tube-removing-hole covers, it is a very expensive and undesirable construction.

With my improved construction it is pos sible to employ ordinary boiler-plate to construct the end plates, to assemble the tubes closely and still have ample room for the necessary tie-bolts, and to remove each of the tube removing hole covers through its cooperating hole.

-I am not aware that an end plate for boilers Was ever made before my invention which embodied all of the above-mentioned features in combination viz., to have the tubes assembled close together, to have a hole in the end plate. concentric with each tube, to have said holes of such shape as will provide space for tie-bolts to give the required'strength to the end plates, and to enable the removal of the tube-removing-hole covers through their respective cooperating holesand I therefore lay claim to such construction of end plate broadly.

I have illustrated my invention in the accompanying sheet of drawings, in which Figure 1 is a front elevation of a portion of a boiler embodying my'invention.

Fig. 2 is a section on line 2 2 of Fig. 1.

Fig. 3 is a view similar to Fig. 1, showing modified constructions of my invention; and Figs. 4 and 5 are detail views showing modified forms of tube-removing holes embodied in my invention.

Similar reference characters refer tosimilar parts throughout the several views.

The water-tubes 10 are connected in the ordinary manner between two water-legs 11, only one of which is shown in the drawings.

The water-legs. consist of a front plate 12, a back plate 18, and a surrounding plate 14, riveted or otherwise secured to the plates 12 and13. The back plate 13 has round holes provided to receive the ends of the tubes 10, which are riveted into the hole in the ordinary manner.

In actual use the tubes are full of water and are located above a fire, where they are subjected to a high temperature to generate steam. To provide means for replacing any of the tubes 10 with new ones when it becomes necessary, openings 15 are provided in the plate 12, concentric with the tubes 10. The openings 15 are some larger than the exterior of the tubes 10, so that the said tubes can be passed through said openings when the riveted portion of the tube is cut away. The openings 15 are closed by the ordinary covers. (Not shown.)

To prevent the plates 1 12 and 13 being pressed outward by the pressure within the boiler, and therefore the water-leg 11, the said two plates are tied together by numerous tie-bolts 16. The tie-bolts 16 are placed as near together as possible, but must of course be so located in relation to the openings 15 as to leave a sufficient area of the plate 12 between the openings 15 and bolts 16 to resist the pressure within the boiler.

As seen in Fig. 1, I make the openings 15 circular with anextension or bulge 17 out on one side sufficient to allow the cover for said opening to be passed through the opening by turning it edgewise. The openings 15 are preferably arranged in horizontal rows with their extensions or bulges 17 downward and are alternately staggered in vertical rows, so that above the lowermost row each hole 15 is directly above the space between two holes 15. This arrangement allows ample space between the lower portions 17 of two holes 15 and a hole 15 for the tie-bolts 16, and, besides, leaves sufficient area of the front plate 12 to give it the required strength. It is impossible to accomplish these mechanical features with any other shaped hole in place of the holes 15, except a round one, which has the objections previously mentioned.

Instead of placing the holes 15 with their bulge 17 downward,they may be arranged with their bulge 17 upward, as shown in one side of Fig. 3, or they may be arranged with their bulge 17 to one or the other side, as shown in one side of Fig. 3; but the general location 01 the holes 15, as related to the tie-bolts 16, is substantially as shown and described in Fig. 1.

It is not absolutely necessary that the ex tension or bulge 17 be exactly as shown in Figs. 1 and 8; but it may take any form whatsoever for instance, as shown in Figs. 1 and From the foregoing description it will be clear to one skilled in the art to which this invention pertains that the construction shown and described herein provides a boiler end plate having flue-removing holes, the covers of which are capable of being passed through said openings, sufiicient room between said openings to accommodate tiebolts, and the tubes closely spaced, which has never before been accomplished.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent of the United States, is-- A boiler end plate provided with tube-inserting openings arranged in rows in one direction and alternately staggered in the other direction, each of said openings having a large end and a small end, and tie-bolts arranged between the small ends of said openings.

In testimony whereof I have signed my name to this specification, in the presence of two sn 1)- scribing witnesses, this 22d day of October, 1903, at Chicago, Illinois.

GEORGE Y. BONUS.

VVitnesses:

A. U. Dnonnn, R. J. JACKER. 

